70% (1976)

40% (1959)

60% (1966)

50% (1968)

0% (1970)

0% (1980)

35% (1974)

40% (1957)

40% (1981)

20% (1963)

65% (1966)

50% (1983)

65% (1986)

66% (1977)

0% (1986)

50% (1982)

48% (1993)

43% (1979)

0% (1979)

50% (1968)